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Geomagnetic activity in October 1991
Mean Ap30.9No. 23 of 1138
G1+ days18
G3+ days5
Max Ap12829 Oct 1991
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Oct 1991 | 7+ | 54 | G3 |
| 2 Oct 1991 | 6+ | 67 | G2 |
| 4 Oct 1991 | 6o | 35 | G2 |
| 6 Oct 1991 | 5+ | 23 | G1 |
| 7 Oct 1991 | 6- | 32 | G2 |
| 8 Oct 1991 | 7- | 41 | G3 |
| 10 Oct 1991 | 5+ | 30 | G1 |
| 20 Oct 1991 | 5- | 22 | G1 |
| 21 Oct 1991 | 5o | 28 | G1 |
| 23 Oct 1991 | 5+ | 22 | G1 |
| 24 Oct 1991 | 5- | 23 | G1 |
| 25 Oct 1991 | 5+ | 38 | G1 |
| 26 Oct 1991 | 5o | 32 | G1 |
| 27 Oct 1991 | 6+ | 50 | G2 |
| 28 Oct 1991 | 8+ | 98 | G4 |
| 29 Oct 1991 | 8+ | 128 | G4 |
| 30 Oct 1991 | 6- | 34 | G2 |
| 31 Oct 1991 | 7o | 59 | G3 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| October 1990 | 14.6 | 9 | 0 |
| October 1991 | 30.9 | 18 | 5 |
Dates and time slots are UTC. Kp is the 3-hourly planetary geomagnetic index (0–9); Ap is the daily average disturbance. G1–G5 follow the NOAA storm scale (Kp 5- and above counted as G1). Aurora visibility also depends on weather and location. The latest values are preliminary.
← September 1991November 1991 →
About this page
Mean Ap 30.9 in October 1991, No. 23 of 1138 months since 1932; 18 days reached G1 or higher.